I am trying to implement a joined inheritance model like so:
{code}@Entity
@Table(name = "Test")
@Inheritance(strategy = InheritanceType.JOINED)
@DiscriminatorColumn(name = "testType", discriminatorType = DiscriminatorType.STRING, length = 10)
public abstract class TestEntity
{
@Column(insertable = false, updatable = false)
private String testType;
}
{code}
{code}@Entity
@Table(name = "TestType1")
@DiscriminatorValue("type1")
public class TestOneEntity extends TestEntity
{}
{code}
If With Spring Boot, I am setting (for development purposes):
{code}
HibernateJpaVendorAdapter adapter = new HibernateJpaVendorAdapter();
adapter.setDatabasePlatform(SqlServer2014Dialect.class.getCanonicalName());
adapter.setGenerateDdl(true);
{code}
and my Hibernate configuration is like so:
{code}
hibernate.use_nationalized_character_data = true
{code}
so that String fields in my JPA entities are persisted as NVARCHAR (instead of VARCHAR) . However , then I am unable to load data any record from the database SQL table because the schema is generated with the discriminator column as a VARCHAR (instead of NVARCHAR) - here is the stack trace for trying to findOne from the JPA repository:
{code}
Caused by: org.springframework.orm.jpa.JpaSystemException: Could not read entity state from ResultSet : EntityKey[a.b.c.TestEntity#1]; nested exception is org.hibernate.exception.GenericJDBCException: Could not read entity state from ResultSet : EntityKey[a.b.c.TestEntity#1]
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.convertHibernateAccessException(HibernateJpaDialect.java:314) ~[spring-orm-4.2.5.RELEASE.jar:4.2.5.RELEASE]
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:225) ~[spring-orm-4.2.5.RELEASE.jar:4.2.5.RELEASE]
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.translateExceptionIfPossible(AbstractEntityManagerFactoryBean.java:436) ~[spring-orm-4.2.5.RELEASE.jar:4.2.5.RELEASE]
at org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible(ChainedPersistenceExceptionTranslator.java:59) ~[spring-tx-4.2.5.RELEASE.jar:4.2.5.RELEASE]
at org.springframework.dao.support.DataAccessUtils.translateIfNecessary(DataAccessUtils.java:213) ~[spring-tx-4.2.5.RELEASE.jar:4.2.5.RELEASE]
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:147) ~[spring-tx-4.2.5.RELEASE.jar:4.2.5.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.2.5.RELEASE.jar:4.2.5.RELEASE]
at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:119) ~[spring-data-jpa-1.9.0.RELEASE.jar:na]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.2.5.RELEASE.jar:4.2.5.RELEASE]
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92) ~[spring-aop-4.2.5.RELEASE.jar:4.2.5.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.2.5.RELEASE.jar:4.2.5.RELEASE]
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:208) ~[spring-aop-4.2.5.RELEASE.jar:4.2.5.RELEASE]
at com.sun.proxy.$Proxy79.findOne(Unknown Source) ~[na:na]
...
...
Caused by: org.hibernate.exception.GenericJDBCException: Could not read entity state from ResultSet : EntityKey[a.b.c.TestEntity#1]
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:47) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:109) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:95) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
at org.hibernate.loader.plan.exec.process.internal.EntityReferenceInitializerImpl.loadFromResultSet(EntityReferenceInitializerImpl.java:323) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
at org.hibernate.loader.plan.exec.process.internal.EntityReferenceInitializerImpl.hydrateEntityState(EntityReferenceInitializerImpl.java:235) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
at org.hibernate.loader.plan.exec.process.internal.AbstractRowReader.readRow(AbstractRowReader.java:103) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
at org.hibernate.loader.plan.exec.internal.EntityLoadQueryDetails$EntityLoaderRowReader.readRow(EntityLoadQueryDetails.java:238) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
at org.hibernate.loader.plan.exec.process.internal.ResultSetProcessorImpl.extractResults(ResultSetProcessorImpl.java:112) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
at org.hibernate.loader.plan.exec.internal.AbstractLoadPlanBasedLoader.executeLoad(AbstractLoadPlanBasedLoader.java:122) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
at org.hibernate.loader.plan.exec.internal.AbstractLoadPlanBasedLoader.executeLoad(AbstractLoadPlanBasedLoader.java:86) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
at org.hibernate.loader.entity.plan.AbstractLoadPlanBasedEntityLoader.load(AbstractLoadPlanBasedEntityLoader.java:167) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:3956) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
at org.hibernate.event.internal.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:508) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
at org.hibernate.event.internal.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:478) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:219) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:278) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
at org.hibernate.event.internal.DefaultLoadEventListener.doOnLoad(DefaultLoadEventListener.java:121) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:89) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1129) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
at org.hibernate.internal.SessionImpl.access$2600(SessionImpl.java:164) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
at org.hibernate.internal.SessionImpl$IdentifierLoadAccessImpl.load(SessionImpl.java:2696) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
at org.hibernate.internal.SessionImpl.get(SessionImpl.java:975) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.find(AbstractEntityManagerImpl.java:1075) ~[hibernate-entitymanager-5.0.9.Final.jar:5.0.9.Final]
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.find(AbstractEntityManagerImpl.java:1039) ~[hibernate-entitymanager-5.0.9.Final.jar:5.0.9.Final]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_77]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_77]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_77]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_77]
at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:294) ~[spring-orm-4.2.5.RELEASE.jar:4.2.5.RELEASE]
at com.sun.proxy.$Proxy74.find(Unknown Source) ~[na:na]
at org.springframework.data.jpa.repository.support.SimpleJpaRepository.findOne(SimpleJpaRepository.java:235) ~[spring-data-jpa-1.9.0.RELEASE.jar:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_77]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_77]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_77]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_77]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.java:475) ~[spring-data-commons-1.11.0.RELEASE.jar:na]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:460) ~[spring-data-commons-1.11.0.RELEASE.jar:na]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:432) ~[spring-data-commons-1.11.0.RELEASE.jar:na]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.2.5.RELEASE.jar:4.2.5.RELEASE]
at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:61) ~[spring-data-commons-1.11.0.RELEASE.jar:na]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.2.5.RELEASE.jar:4.2.5.RELEASE]
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99) ~[spring-tx-4.2.5.RELEASE.jar:4.2.5.RELEASE]
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281) ~[spring-tx-4.2.5.RELEASE.jar:4.2.5.RELEASE]
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96) ~[spring-tx-4.2.5.RELEASE.jar:4.2.5.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.2.5.RELEASE.jar:4.2.5.RELEASE]
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136) ~[spring-tx-4.2.5.RELEASE.jar:4.2.5.RELEASE]
... 14 common frames omitted
Caused by: com.microsoft.sqlserver.jdbc.SQLServerException: The conversion from varchar to NCHAR is unsupported.
at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDriverError(SQLServerException.java:191) ~[jdbc-4.2.0.jar:na]
at com.microsoft.sqlserver.jdbc.DataTypes.throwConversionError(DataTypes.java:1241) ~[jdbc-4.2.0.jar:na]
at com.microsoft.sqlserver.jdbc.ServerDTVImpl.getValue(dtv.java:2943) ~[jdbc-4.2.0.jar:na]
at com.microsoft.sqlserver.jdbc.DTV.getValue(dtv.java:206) ~[jdbc-4.2.0.jar:na]
at com.microsoft.sqlserver.jdbc.Column.getValue(Column.java:130) ~[jdbc-4.2.0.jar:na]
at com.microsoft.sqlserver.jdbc.SQLServerResultSet.getValue(SQLServerResultSet.java:2087) ~[jdbc-4.2.0.jar:na]
at com.microsoft.sqlserver.jdbc.SQLServerResultSet.getValue(SQLServerResultSet.java:2072) ~[jdbc-4.2.0.jar:na]
at com.microsoft.sqlserver.jdbc.SQLServerResultSet.getNString(SQLServerResultSet.java:2442) ~[jdbc-4.2.0.jar:na]
at com.zaxxer.hikari.pool.HikariProxyResultSet.getNString(HikariProxyResultSet.java) ~[HikariCP-2.4.3.jar:na]
at org.hibernate.type.descriptor.sql.NVarcharTypeDescriptor$2.doExtract(NVarcharTypeDescriptor.java:62) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
at org.hibernate.type.descriptor.sql.BasicExtractor.extract(BasicExtractor.java:47) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
at org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:238) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
at org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:234) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
at org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:224) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
at org.hibernate.type.AbstractStandardBasicType.hydrate(AbstractStandardBasicType.java:300) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
at org.hibernate.persister.entity.AbstractEntityPersister.hydrate(AbstractEntityPersister.java:2727) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
at org.hibernate.loader.plan.exec.process.internal.EntityReferenceInitializerImpl.loadFromResultSet(EntityReferenceInitializerImpl.java:308) ~[hibernate-core-5.0.9.Final.jar:5.0.9.Final]
... 56 common frames omitted
{code}
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